Rotary pump



I c; w. VAN RANsT -2,276',355

March 17, 1942.

' ROTARY PUMP Filed May 19, 1938 11v VENTOR v Car a/ids 11 lizfivzsif BYv I A T1 N5 Y5- Patented Mar. 17, 1942 UNITED STATES PATENT OFFICEROTARY rum Cornelius W. Van Ranst, Detroit, Mich.

Application May 19, 1938, Serial No. 208,754

6 Claims.

ing mechanism for pumping fluids having suspended solid particles ofabrasive substances therein.

A further object of the present invention is to provide a rotary pumpadaptedfor use in pumping fluids and in which the rotor member is soconstructed as to eliminate the necessity for valves, springs and rotorblades.

Another object of the present invention is to provide a rotary pumpconstruction which is so designed that the body portion may be formed ofa die casting and the pump placed in operation without machining of thecasting, the variations in the pumping chamber being accommodated by theresiliency of the rotary pumping element.

Other objects of this invention will appear in the following descriptionand appended claims, reference being had to the accompanying drawingforming a part of this specification, wherein l ke reference charactersdesignate corresponding parts in the several views.

Fig. 1 is a fragmentary elevation showing a portion of the rotary pumpof the present invention adapted for use as a water pump to supply acooling fluid to an internal combustion engine of the outboard marinetype.

Fig. 2 is a sectional view taken substantially on the line 2-2 of Fig. lin the direction of the arrows.

Fig. 3 is a fragmentary view in section taken substantially on the line33 of Fig. 2 in the dimotion of the arrows.

Figs. 4 and 5 are sectional views of the pump elements takensubstantially on the line 2-2 of Fig. 1.

Before explaining in detail the present invention it is to be understoodthat the invention is not limited in its application to the details ofconstruction and arrangement of parts illustrated in the accompanyingdrawing, since the invention is capable of other embodiments and ofbeing practiced or carried out in various ways. Also it is to'beunderstood that the phraseology or terminology employed herein is forthe purpose of description and not of limitation, and

it is not intended to limit the invention claimed herein beyond therequirements of the prior art.

Referring to the drawing, l0 designates a power driven main shaft whichis mounted within a the water line by means of the rotary pump of thepresent invention.

The rotary pump of the present invention comprises a body portion i5preferably formed of a die casting having a pumping chamber it formed inthe interior thereof. The chamber I6 is concentric with the shaft ID. Apropeller shaft casting H is maintained in position adjacent a flange onthe body portion l5 by means of stay bolts l8 and I9 which hold theassembled parts in their respective positions.

Since the construction of the outboard motor to which the rotary pump ofthe present invention is attached is not. a feature of the presentinvention, the construction is not described in detail except insofar asit assists in explaining the present invention. The casting ll extendsbelow the rotary pump of the present invention and surrounds the mainshaft l0. Driving gears (not shown) are connected to the end of the mainshaft l0 and to the horizontal propeller shaft (not shown) to drive thehorizontal propeller shaft from the vertical shaft Ill. The propellertorque thrust iscarried by the casting l1 and is transmitted through theplate ll to the boat by means of connections (not shown) between theplate IB and the boat. The numeral 29 designates an oil line leadingfrom a reservoir (not shown) to the transfer gear mechanism (not shown)in the lower part of the casting H.

The pump mechanism of the present invention is contained within thepumping chamber l6 and comprises a disc 20 mounted eccentrically on theshaft H) for rotation thereby. Surrounding the disc 20 is a bronzebushing 2| having an extending tongue 22. Rubber or other suitableresilient material 23 is bonded to the bronze bushing 2l' and isprovided with an extending portion 24 in the nature of an arm providedon its outer end with a cross part or body having its ends fixed orsecured and thereby anchored to opposed wall portions of a recess 2!which is cast in the body portion ll, said arm extending into saidrecess and its cross part or body being'conflned therein. An inlet port26 is provided in the body casting l8 and communicates with the chamberll and the open space enclosed by the stamped members I. A .dischargeport 21 formed in the body portion ll communicates with the chamber I!and discharges fluid through the discharge conduit 22 from which thecooling fluid passes to the parts of the internal combustion engine tobe cooled.

The operation of a pump embodying the present invention will be bestunderstood by refer ence to Figs. 2, 4 and 5, in which is shown therelative positions of the parts during various stages in one completepumping cycle. .In all of the viewsit is assumed that the direction ofrotation of the shaft Iii is in the counterclockwise direction. It is tobe understood, however, that the shaft ill may operate in a clockwisedirection, in which event the hereinafter described operation ofthe'pump will be in the opposite manner, that is, the inlet port 26 willbecome the discharge port and the discharge port 21 will then become theinlet port; otherwise, however, the operation of the pump will be asdescribed herein.

Upon rotation of the shaft Iii in the counterclockwise direction theeccentric member 20 is likewise rotated in the same direction andimparts an eccentric rotary motion to the bushing 2| surrounding it.when the parts are in the position shown in Fig. 2, the pump is at thebeginning of its pumping cycle. In this position the inlet port 28 ispartially closed by the adjacent surface of the resilient member 23 andthe discharge port 21 is partially free from contact with the surface ofthe resilient member 23. Fluid which is entrapped in the space betweenthe outer surface of the resilient member 23 and the wall of the pumpingchamber i8 is forced out through the discharge port 21 as the rotationcontinues and the parts occupy the relative positions shown in Fig. 4.As is. there shown, the resilient member 23 adjacent the high spot onthe eccentric member 20 is in contact with a surface of the wall of thechamber l6 and forces the fluid ahead of such point of contact in thedirection of the arrows through the discharge port 21. In moving fromthe positions shown in Fig. 2 to those shown in Fig. 4, it is apparentthat the inlet port 25 will be entirely closed du ing the time that thehigh point on the member 20 passes over it to come to the position shownin Fig. 4. After the high spot on the eccentric member 20 passes theinlet port 26 and moves to the position shown in Fig. 4, the inlet port28 is open and the continued movement of the rotor causes a slightsuction to be exerted thereon. As the rotation of the rotor continues,the parts move to the positions shown in Fig. 5 where it will be notedthat the point of contact between the surface of the resilient member 23and the chamber l6 has moved in a counterclockwise direction toward thedischarge port 21. This movement has caused the fluid in the chamher, asshown in Fig. 4, to be expelled through the discharge port 21. The samemovement causes fluid to be drawn into the chamber through the inletport 26. As the movement of the parts then continues the parts resumethe positions shown in Fig. 2 in which the point of contact between thesurface of the resilient member 22 and the wall of the chamber II issuch that the inlet port is partially closed and the discharge port ispartially open. The movement of the eccentric member 2| and the bushing2| is accommodated by the distortion of the cross part or body of theextending portion 24, the intermediate portion of said cross part orbody flexing back and forth in the recess 25 as said cross part or bodyis distorted by rotation of the eccentric member 20. The tongue 22 onthe bushing 2| serves as a reinforcement for the arm of said extendingportion 24, as will be readily understood.

The resilient member 22 is formed of rubber or other suitable resilientmaterials and may be bonded according to any conventionally knownmethods to the bronze shell 2! so that the body portion of the resilientmember 23 forms in effect a concentric shell around the bushing 2|. Theextending portion 24 is held in a position in the chamber l8 and therecess 25 between the inlet port 28 and the discharge port 21 and at alltimes during the pumping cycle acts as a partition, which with themoving contact between the wall of the chamber. l6 and the resilientmaterial adjacent the high point on the member 20, divides the chamber16 in a discharge portion and a suction portion.

It will be seen that the construction thus pro! vided will operatesuccessfully in the pumping of fluids even though there be suspendedsolids therein, for the passage of such solids between the surface ofthe chamber l6 and the rotary pumping member will be accommodated bydistortion of the surfaces of the resilient covering 23 on the rotarymember. As is well known,

. various fluids, such for example as water, have a lubricating effectupon rubber so that the pump as herein disclosed will operate with areduced amount of friction due to the lubricating effect of water on therubber at the point of surface contact between the rubber covering 23and the walls of the chamber I6.

I claim:

1. A rotary pump comprising a pumping chamber having an inlet port and adischarge port, a rotary pumping element mounted in said chamber andcomprising a power driven eccentric member, a bushing rotatably mountedon said eccentric member and having a body portion concentric with saideccentric member and an extending lug maintained in an intermediateposition between said ports, a resiliently surfaced pumping elementmounted concentrically on said bushing and having a tongue surroundingsaid lug and anchored in the walls of said chamber, said resilientelement being adapted to maintain a moving, fluid-tight resilientsurface contact with the interior wall of said pumping chamber at apoint adjacent the high point on said eccentric member and to open andclose the said ports during each revolution of said eccentric member andto provide a flexible partition in said chamber between said inlet andoutlet ports.

2. A rotary pump comprising a pumping chamber having an inlet port and adischarge port, a rotary pumping element mounted in said chamber andcomprising a power driven eccentric member, a concentric bushingrotatably mounted thereon and having an extending lug maintained in anintermediate position between said ports, a pumping element mountedconcentrically thereon and comprising a layer 01' resilient materialsecured to said bushing and having an extending portion secured to saidlug and 3. A rotary pump comprising a body portion having a pumpingchamber having inlet and outlet ports. a pumping member rotatable insaid chamber and comprising a power driven eccentric cam, a bushingrotatably mounted thereon and having an extending lug disposed betweensaid inlet and outlet ports, a covering of resilient material secured tosaid bushing and lug and having extending portions adjacent said luganchored in said body portion to provide a positive fluid-tight sealbetween said lug and said chamber, said covering being of suflicientthickness to be deformed between the wall of the pumping chamber and thehigh joint on said eccentric cam during each revolution of said pumpingmember to establish and maintain a moving, substantially fluid-tightresilient surface contact with the walls of said pumping chamber atpoints adjacent the high spot on said eccentric cam, thereby to create apredetermined suction at said inlet port and to deliver a fluid underpredetermined pressures at said discharge port.

4. A rotary pump comprising a body portion outlet ports communicatingtherewith, a pumping member rotatable in said chamber and comprising apower driven eccentric cam, a bushing rotatably mounted thereon andhaving an extending lug disposed between'said ports, a concentric layerof resilient material secured to said bushing and lug and secured insaid chamber at points adjacent said lug to provide a re-' taining apumping chamber having an inlet port and a discharge port, said casingalso containing a recem extending outwardly from said containing apumping chamber having inlet and chamber between said inlet anddischarge ports, a distortable body located in said recess andhaving-its ends secured or fixed to opposed wall portions of saidrecess, the intermediate portion of said body flexing back and forth insaid recess as said body is distorted, an eccentric member rotatable insaid chamber and having a resiliently surfaced pumping element mountedconcentrically thereon to maintain a moving fluid-tight surface contactwith the interior wall of said pumping chamber at a point adjacent-thehigh point on said eccentricmember, said re-- siliently surfaced pumpingelement having a portion extending into said recess and connected to anintermediate portion of said distortable body to providea fluid-tightseal between said ports creating a predetermined negative pressure atthe inlet port and a predetermined positive pressure on the fluiddelivered to the discharge port during each revolution of said eccentricmember.

6. A rotary pump, comprising a casing containing a pumping chamberhaving an inlet port and a discharge port, said casing also containing arecess extending outwardly from saidchamber between said inlet anddischarge ports, an eccentric member rotatably mounted in said chamber,and a resilient member in said chamber surrounding and movable with saideccentric member and having resilient fluid-tight contact for pumpingpurposes with successive portions of the chamber wall during rotation ofsaidvecv centric member, said resilient member having a reinforced armextending outwardly into said recess and also having a distortable bodyon the outer end of said arm, said body being disposed substantiallynormal to said arm and said arm being connected to an intermediateportion or

